Vacuum cleaner



FIG. 1 is a perspective view of a vacuum cleaner showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right-side elevational view thereof;

FIG. 5 is a left-side elevational view thereof; and,

FIG. 6 is a top plan view thereof.

The broken line showings of a button, a cord, and a tank are for the purpose of illustrating the article and form no part of the claimed design. 

The ornamental design for a vacuum cleaner, as shown and described. 